<!DOCTYPE html>
<html lang='en'>
<head>
    <meta charset='UTF-8'>
    <meta name='viewport' content='width=device-width, initial-scale=1.0'>
    <meta http-equiv='X-UA-Compatible' content='ie=edge'>
    <title>Document</title>
</head>
<body>
    <div id='app'>
        <input type="text" value="123" v-color="obj">
    </div>
    <script src='https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js'></script>
    <script>
        Vue.directive("color",{
            bind(el,binding){
                el.style.color=binding.value.color;
                el.style.background=binding.value.bgcolor;
            }
        })
        new Vue({
            el: '#app',
            data:{ 
                obj:{
                    color:"red",
                    bgcolor:"green",
                }
             },
            methods:{},
        })
    </script>
</body>
</html>